Make ExternalizeStringExtension free its data on exit to please

test/mjsunit/string-replace-with-empty.js

 // Copyright 2010 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
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 //       notice, this list of conditions and the following disclaimer.
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 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --expose-externalize-string
+// Flags: --expose-externalize-string --expose-gc
 
-assertEquals("0123", "aa0bb1cc2dd3".replace(/[a-z]/g, ""));
-assertEquals("0123", "\u1234a0bb1cc2dd3".replace(/[\u1234a-z]/g, ""));
+function test() {
+  assertEquals("0123", "aa0bb1cc2dd3".replace(/[a-z]/g, ""));
+  assertEquals("0123", "\u1234a0bb1cc2dd3".replace(/[\u1234a-z]/g, ""));
 
-var expected = "0123";
-var cons = "a0b1c2d3";
-for (var i = 0; i < 5; i++) {
-  expected += expected;
-  cons += cons;
+  var expected = "0123";
+  var cons = "a0b1c2d3";
+  for (var i = 0; i < 5; i++) {
+    expected += expected;
+    cons += cons;
+  }
+  assertEquals(expected, cons.replace(/[a-z]/g, ""));
+  cons = "\u12340b1c2d3";
+  for (var i = 0; i < 5; i++) {
+    cons += cons;
+  }
+  assertEquals(expected, cons.replace(/[\u1234a-z]/g, ""));
+
+  cons = "a0b1c2d3";
+  for (var i = 0; i < 5; i++) {
+    cons += cons;
+  }
+  externalizeString(cons, true/* force two-byte */);
+  assertEquals(expected, cons.replace(/[a-z]/g, ""));
+  cons = "\u12340b1c2d3";
+  for (var i = 0; i < 5; i++) {
+    cons += cons;
+  }
+  externalizeString(cons);
+  assertEquals(expected, cons.replace(/[\u1234a-z]/g, ""));
 }
-assertEquals(expected, cons.replace(/[a-z]/g, ""));
-cons = "\u12340b1c2d3";
-for (var i = 0; i < 5; i++) {
-  cons += cons;
-}
-assertEquals(expected, cons.replace(/[\u1234a-z]/g, ""));
 
-cons = "a0b1c2d3";
-for (var i = 0; i < 5; i++) {
-  cons += cons;
-}
-externalizeString(cons, true/* force two-byte */);
-assertEquals(expected, cons.replace(/[a-z]/g, ""));
-cons = "\u12340b1c2d3";
-for (var i = 0; i < 5; i++) {
-  cons += cons;
-}
-externalizeString(cons);
-assertEquals(expected, cons.replace(/[\u1234a-z]/g, ""));
+test();
+
+// Clear the regexp cache to allow the GC to work.
+"foo".replace(/foo/g, "");
+
+// GC in order to free up things on the C side so we don't get
+// a memory leak.  This makes valgrind happy.
+gc();
+gc();